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    • 1. 发明授权
    • Self-cooling lance for oxygen blowing
    • 自冷式氧气吹瓶
    • US3802681A
    • 1974-04-09
    • US24159872
    • 1972-04-06
    • MESSER GRIESHEIM GMBH
    • PFEIFER F
    • C21C5/46C21C7/00
    • C21C5/4613C21C5/4606
    • An oxygen blowing lance has a narrow annular or ring-shaped channel formed between a pair of spaced tubes having a relatively small flow area. This accelerates the speed of flow enough to generate a cooling effect which eliminates the need for any extraneous cooling, such as water cooling. A speed of oxygen flow between 400 and 900 meters per second (at standard conditions of 760 mm Hg. and 0*C) limits the wall temperature of the lance at the nozzle outlet to about 500*C and prevents spalling and burning off. The hollow or ring-shaped oxygen channel makes the lance remarkably strong and rigid. The ring-shaped channel may be elliptical, triangular or rectangular as well as circular. A ring-shaped or circular annular cross-section having a thickness of from about 3 to 10 mm and preferably from 4 to 7 mm is particularly advantageous. The cooling effect of the oxygen in the annular or ring-shaped channel is enhanced by installing a helical coil in the annular channel. This increases the rate of flow and cooling effect of the oxygen and the spiral path of flow also provides cooling. The helical pitch of the coil may vary along the length of the lance to provide any desired control of speed of flow and resistance. The cooling effect of the oxygen may be further improved by adding small quantities of water into the oxygen stream.
    • 氧吹枪具有形成在具有相对小的流动面积的一对隔开的管之间的窄的环形或环形通道。 这加速了足够的流速以产生冷却效果,这消除了对诸如水冷却的任何外部冷却的需要。 400至900米/秒(标准条件为760毫米汞柱和0℃)之间的氧气流速将喷嘴出口处喷枪的壁温限制在约500℃,并防止剥落和燃烧。 中空或环形氧气通道使得喷枪显着强大和刚性。 环形通道可以是椭圆形,三角形或矩形以及圆形。 具有约3至10mm,优选4至7mm厚度的环形或圆形环形横截面是特别有利的。 通过在环形通道中安装螺旋线圈来增强环形或环形通道中氧气的冷却效果。 这增加了氧气的流量和冷却效果,并且流动的螺旋路径也提供了冷却。 线圈的螺距可以沿喷枪的长度变化,以提供对流动速度和阻力的任何期望的控制。 通过向氧气流中加入少量的水,可以进一步提高氧的冷却效果。
    • 2. 发明授权
    • Device for plasma welding and cutting
    • 等离子焊接和切割装置
    • US3783229A
    • 1974-01-01
    • US3783229D
    • 1972-08-02
    • MESSER GRIESHEIM GMBH
    • ROHE JSTAACKS D
    • H05H1/36B23K10/00B23K9/06
    • B23K10/006
    • A device for plasma welding and cutting by means of a plasma torch or burner. A first current source is provided for feeding a pilot arc discharge. The negative pole of the current source is connected to the electrode of the burner while the positive pole is connected to the nozzle of the burner. A second current source feeds the main plasma arc discharge and its negative pole is connected to the burner electrode and the positive pole to the work piece. Specifically, the current branch of the second current source which connects to the work piece is bypassed by a bypass branch in such a manner that when the plasma main arc discharge current is closed the resulting peak current is diverted through this bypass branch.
    • 用于通过等离子体焰炬或燃烧器等离子体焊接和切割的装置。 提供第一电流源用于馈送导电电弧放电。 电流源的负极连接到燃烧器的电极,而正极连接到燃烧器的喷嘴。 第二电流源馈送主等离子体电弧放电,其负极连接到燃烧器电极和正极连接到工件。 具体地,连接到工件的第二电流源的当前支路被旁路支路旁路,使得当等离子体主电弧放电电流闭合时,所得到的峰值电流通过该旁路支路转向。